EP0545492A1 - Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts - Google Patents

Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts Download PDF

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Publication number
EP0545492A1
EP0545492A1 EP92203688A EP92203688A EP0545492A1 EP 0545492 A1 EP0545492 A1 EP 0545492A1 EP 92203688 A EP92203688 A EP 92203688A EP 92203688 A EP92203688 A EP 92203688A EP 0545492 A1 EP0545492 A1 EP 0545492A1
Authority
EP
European Patent Office
Prior art keywords
lcd
projection
extend
image
lcd panel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP92203688A
Other languages
English (en)
French (fr)
Inventor
Stephen Magocs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0545492A1 publication Critical patent/EP0545492A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses

Definitions

  • the present invention relates to a LCD image projection system comprising, in this order:
  • image projection system should be understood in a wide sense and comprises a device for displaying, for example, a video image, a graphic image, numerical information or a combination thereof.
  • the images may be both monochrome and colour images.
  • the display system may comprise three colour channels for, for example, the primary colours red, green and blue, each channel comprising a display panel.
  • the direction of two sides of the LCD panel is effective parallel to the direction of the screen-lenticulars is meant that the direction of the images of these sides, formed on the projection screen by the projection lens system and optical elements between the panel and the projection lenssystem, is parallel to that of the lenticulars.
  • FIG. 1 shows schematically a conventional rear projection system, i.e. a system wherein the projection screen is transmissive and the image display subsystem is arranged at one side of the screen and the audience is at the opposite side of the screen.
  • an illumination subsystem represented by a lamp 101
  • the LCD panel 102 is controlled to selectively block light from the lamp in patterns which create an image, for example a picture.
  • Light passing through the LCD panel 102 then passes through a projection lens system represented by a single lens 103 to be focused on a projection screen 104.
  • the projection screen 104 comprises vertical lenticulars which may be separated by vertical black stripes. The stripes are added to increase contrast.
  • Figure 2 shows at 202 the structure of the LCD panel with the vertically and horizontally extending interpixel regions or strokes 201 and 203 respectively.
  • the projection screen structure is shown with the vertically extending lenticulars and black stripes 205 and 206 respectively.
  • 207 represents the apparent moiré patterns of black strokes 208 and image strokes 209. This Moiré pattern is annoying for the viewer and shades the projection image.
  • image projection systems wherein a Fresnel lens structure is added to the screen, for concentrating light from the LCD panel in the audience room, the Moiré effect is increased due to the vertical patterns of the Fresnel lens.
  • the object of the invention is to provide an LCD projection system with reduced moiré.
  • the system according to the invention is characterized in that the interpixel regions of the LCD panel extend in a direction substantially different from said first and second directions.
  • Fig. 1 shows a conversional LCD projection television.
  • Fig. 2 shows how the moiré fringes arise in this conversional television.
  • Fig. 3 shows how a diagonally oriented LCD matrix reduces moiré fringes.
  • Fig. 4 shows a rear LCD projection TV system which has three LCD panels.
  • a diagonally oriented LCD panel 302 is used in place of the vertically oriented LCD panel 202.
  • the screen 204 may be according to Kokai 1-79728.
  • the diagonally oriented panel 302 has LCD elements which are diamond-shaped, i.e. squares which are rotated 45° from the vertical, and the interpixel regions are diagonal.
  • the apparent width of the vertical stripes is not enlarged, as will be clear when comparing the black stripes 308 of the apparent structure 303 with the black stripes 206 of the screen 204.
  • diagonal is 45° from the vertical. 45° gives a minimum moiré interference.
  • the LCD elements may have other shapes so long as the interpixel regions, projected on the lenticular screen, are not parallel to the lenticular.
  • Fig. 4 shows an embodiment of a color projection system wherein the invention is used.
  • an illumination beam b from the illumination system A comprising a lamp 401 and a reflector 400, is split in the color selective splitter 402 into three separate beams, one for each of the three colors red, green and blue.
  • the three beams, of which only the chief rays b r , b g and b b are shown, are incident on three LCD panels 403, 406 and 407, forming parts of the image display subsystem B.
  • Each of the three LCD panels is controlled according to the component of the respective color in the picture to be displayed.
  • Light from the LCD panels 403 and 407 is routed by mirrors 404 and 405, respectively mirrors 408 and 409 to the color selective beam combining element 410.
  • Light from LCD panel 406 is naturally incident on beam combining element 410.
  • the three beams are then combined in the beam combining element 410.
  • the combined beam b c from the beam combiner 410 which contains all the color image information, is directed to a projection lenssystem 411.
  • the projection lenssystem images the three LCD's in a superposed manner on the projection screen 412.
  • each LCD panel's pixels are oriented diagonally, so that none of the LCD's interpixel regions introduce moiré interference at the lenticular screen 412. While those ordinary skill in the art might devise any number of light paths for use in such a projection system, the moiré patterns will be reduced so long as the interpixel regions, as projected on the lenticular screen, are not parallel to the lenticular.
  • the invention has been described for a rear projection system, it can also be used in a front projection system, i.e. a system with a reflective projection screen, wherein the projection screen has vertical lenticulars.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Liquid Crystal (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Overhead Projectors And Projection Screens (AREA)
EP92203688A 1991-12-03 1992-11-30 Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts Withdrawn EP0545492A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/801,239 US5317409A (en) 1991-12-03 1991-12-03 Projection television with LCD panel adaptation to reduce moire fringes
US801239 1991-12-03

Publications (1)

Publication Number Publication Date
EP0545492A1 true EP0545492A1 (de) 1993-06-09

Family

ID=25180562

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92203688A Withdrawn EP0545492A1 (de) 1991-12-03 1992-11-30 Flüssigkristall-Bildprojektionssystem mit Verringerung des Moiré-Effekts

Country Status (3)

Country Link
US (1) US5317409A (de)
EP (1) EP0545492A1 (de)
JP (1) JPH05273516A (de)

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EP0833184A1 (de) * 1996-09-30 1998-04-01 Sharp Kabushiki Kaisha Räumlicher Lichtmodulator mit horizontal überlappenden Bildelementen
EP0833186A1 (de) * 1995-06-08 1998-04-01 Victor Company Of Japan, Limited Flüssigkristall-Anzeigevorrichtung vom Projektionstyp
US6801243B1 (en) 1997-07-23 2004-10-05 Koninklijke Philips Electronics N.V. Lenticular screen adaptor
EP1528528A2 (de) * 2003-10-30 2005-05-04 Hewlett-Packard Development Company, L.P. Einrichtung und Verfahren zur Bilddarstellung

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US5701185A (en) * 1994-11-21 1997-12-23 Polaroid Corporation Spatial light modulator assembly for adapting a photographic printer to print electronic images
US6280063B1 (en) 1997-05-09 2001-08-28 3M Innovative Properties Company Brightness enhancement article
US7301549B2 (en) * 2003-10-30 2007-11-27 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames on a diamond grid
US20050093894A1 (en) * 2003-10-30 2005-05-05 Tretter Daniel R. Generating an displaying spatially offset sub-frames on different types of grids
US7355612B2 (en) 2003-12-31 2008-04-08 Hewlett-Packard Development Company, L.P. Displaying spatially offset sub-frames with a display device having a set of defective display pixels
US7463272B2 (en) * 2004-01-30 2008-12-09 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames
US7483044B2 (en) * 2004-01-30 2009-01-27 Hewlett-Packard Development Company, L.P. Displaying sub-frames at spatially offset positions on a circle
US20050225571A1 (en) * 2004-04-08 2005-10-13 Collins David C Generating and displaying spatially offset sub-frames
US20050225570A1 (en) * 2004-04-08 2005-10-13 Collins David C Generating and displaying spatially offset sub-frames
US7660485B2 (en) * 2004-04-08 2010-02-09 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames using error values
US7657118B2 (en) * 2004-06-09 2010-02-02 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames using image data converted from a different color space
US20050275669A1 (en) * 2004-06-15 2005-12-15 Collins David C Generating and displaying spatially offset sub-frames
US7668398B2 (en) * 2004-06-15 2010-02-23 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames using image data with a portion converted to zero values
US7453478B2 (en) * 2004-07-29 2008-11-18 Hewlett-Packard Development Company, L.P. Address generation in a light modulator
US7522177B2 (en) * 2004-09-01 2009-04-21 Hewlett-Packard Development Company, L.P. Image display system and method
US7453449B2 (en) * 2004-09-23 2008-11-18 Hewlett-Packard Development Company, L.P. System and method for correcting defective pixels of a display device
US7474319B2 (en) * 2004-10-20 2009-01-06 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames
US7676113B2 (en) * 2004-11-19 2010-03-09 Hewlett-Packard Development Company, L.P. Generating and displaying spatially offset sub-frames using a sharpening factor
US8872869B2 (en) * 2004-11-23 2014-10-28 Hewlett-Packard Development Company, L.P. System and method for correcting defective pixels of a display device
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JP2006285156A (ja) * 2005-03-08 2006-10-19 Kuraray Co Ltd 背面投写型スクリーン及び背面投写型表示装置
US9282335B2 (en) 2005-03-15 2016-03-08 Hewlett-Packard Development Company, L.P. System and method for coding image frames
US7466291B2 (en) * 2005-03-15 2008-12-16 Niranjan Damera-Venkata Projection of overlapping single-color sub-frames onto a surface
US7443364B2 (en) * 2005-03-15 2008-10-28 Hewlett-Packard Development Company, L.P. Projection of overlapping sub-frames onto a surface
WO2006129797A1 (ja) * 2005-06-03 2006-12-07 Kuraray Co., Ltd. 背面投写型表示装置
US7407295B2 (en) * 2005-07-26 2008-08-05 Niranjan Damera-Venkata Projection of overlapping sub-frames onto a surface using light sources with different spectral distributions
US7387392B2 (en) * 2005-09-06 2008-06-17 Simon Widdowson System and method for projecting sub-frames onto a surface
US20070091277A1 (en) * 2005-10-26 2007-04-26 Niranjan Damera-Venkata Luminance based multiple projector system
US7470032B2 (en) * 2005-10-27 2008-12-30 Hewlett-Packard Development Company, L.P. Projection of overlapping and temporally offset sub-frames onto a surface
US20070097017A1 (en) * 2005-11-02 2007-05-03 Simon Widdowson Generating single-color sub-frames for projection
US7559661B2 (en) 2005-12-09 2009-07-14 Hewlett-Packard Development Company, L.P. Image analysis for generation of image data subsets
US20070133087A1 (en) * 2005-12-09 2007-06-14 Simon Widdowson Generation of image data subsets
US20070132967A1 (en) * 2005-12-09 2007-06-14 Niranjan Damera-Venkata Generation of image data subsets
US20070133794A1 (en) * 2005-12-09 2007-06-14 Cloutier Frank L Projection of overlapping sub-frames onto a surface
US20070132965A1 (en) * 2005-12-12 2007-06-14 Niranjan Damera-Venkata System and method for displaying an image
US7499214B2 (en) * 2006-03-20 2009-03-03 Hewlett-Packard Development Company, L.P. Ambient light absorbing screen
US7800628B2 (en) * 2006-06-16 2010-09-21 Hewlett-Packard Development Company, L.P. System and method for generating scale maps
US9137504B2 (en) 2006-06-16 2015-09-15 Hewlett-Packard Development Company, L.P. System and method for projecting multiple image streams
US7854518B2 (en) * 2006-06-16 2010-12-21 Hewlett-Packard Development Company, L.P. Mesh for rendering an image frame
US7907792B2 (en) 2006-06-16 2011-03-15 Hewlett-Packard Development Company, L.P. Blend maps for rendering an image frame
US20070291184A1 (en) * 2006-06-16 2007-12-20 Michael Harville System and method for displaying images
US20080002160A1 (en) * 2006-06-30 2008-01-03 Nelson Liang An Chang System and method for generating and displaying sub-frames with a multi-projector system
US20080024389A1 (en) * 2006-07-27 2008-01-31 O'brien-Strain Eamonn Generation, transmission, and display of sub-frames
US20080024469A1 (en) * 2006-07-31 2008-01-31 Niranjan Damera-Venkata Generating sub-frames for projection based on map values generated from at least one training image
US20080024683A1 (en) * 2006-07-31 2008-01-31 Niranjan Damera-Venkata Overlapped multi-projector system with dithering
JP5037508B2 (ja) 2006-08-09 2012-09-26 シャープ株式会社 液晶表示装置
US20080043209A1 (en) * 2006-08-18 2008-02-21 Simon Widdowson Image display system with channel selection device
US20080095363A1 (en) * 2006-10-23 2008-04-24 Dicarto Jeffrey M System and method for causing distortion in captured images
US20080094419A1 (en) * 2006-10-24 2008-04-24 Leigh Stan E Generating and displaying spatially offset sub-frames
US20080101711A1 (en) * 2006-10-26 2008-05-01 Antonius Kalker Rendering engine for forming an unwarped reproduction of stored content from warped content
US20080101725A1 (en) * 2006-10-26 2008-05-01 I-Jong Lin Image display system configured to update correspondences using arbitrary features
US7742011B2 (en) * 2006-10-31 2010-06-22 Hewlett-Packard Development Company, L.P. Image display system
US20090027504A1 (en) * 2007-07-25 2009-01-29 Suk Hwan Lim System and method for calibrating a camera
US7986356B2 (en) * 2007-07-25 2011-07-26 Hewlett-Packard Development Company, L.P. System and method for determining a gamma curve of a display device
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US9235575B1 (en) 2010-03-08 2016-01-12 Hewlett-Packard Development Company, L.P. Systems and methods using a slideshow generator

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0833186A1 (de) * 1995-06-08 1998-04-01 Victor Company Of Japan, Limited Flüssigkristall-Anzeigevorrichtung vom Projektionstyp
EP0833184A1 (de) * 1996-09-30 1998-04-01 Sharp Kabushiki Kaisha Räumlicher Lichtmodulator mit horizontal überlappenden Bildelementen
US5953148A (en) * 1996-09-30 1999-09-14 Sharp Kabushiki Kaisha Spatial light modulator and directional display
US6801243B1 (en) 1997-07-23 2004-10-05 Koninklijke Philips Electronics N.V. Lenticular screen adaptor
EP1528528A2 (de) * 2003-10-30 2005-05-04 Hewlett-Packard Development Company, L.P. Einrichtung und Verfahren zur Bilddarstellung
EP1528528A3 (de) * 2003-10-30 2007-08-08 Hewlett-Packard Development Company, L.P. Einrichtung und Verfahren zur Bilddarstellung

Also Published As

Publication number Publication date
JPH05273516A (ja) 1993-10-22
US5317409A (en) 1994-05-31

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